New 'alias' subcommand (+ POS_SUBCMDS row, menu option 6 'Manage
aliases'): create/update/list/remove bash aliases that run
'pos system bank run <name>', written into ~/.bashrc inside a managed
marker block (BASH_RC_FILE seam for tests, atomic tmp+mv rewrite).
- alias_valid_name enforces ^[a-zA-Z][a-zA-Z0-9_-]*$
- same-name create is an idempotent retarget; last alias removal cleans
the whole block; outer ~/.bashrc aliases preserved byte-identically
- outer-alias collision refused (file untouched), PATH-shadow non-blocking
warn, 'bank remove' drops aliases pointing at the removed command
- GNU sed '1,0p' edge case (block at line 1) fixed with guarded ranges;
regex-quote literalization avoided via glob case payload match
- t-bank.sh +49 checks (71 -> 120); docs: POS.md, howto/system.md,
tests/README.md, AGENT_TODO.md; make gen byte-idempotent
(also refreshes the pos-communication-telegram-listener filetable
line count so the previous commit's tree is gen-consistent)
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